bugfix: replaced spurious #elif by #else.  No idea how this could ever compile.  Thanks to Christoph Grüniger for the hint

[[Imported from SVN: r8356]]

[[Imported from SVN: r8355]]

[[Imported from SVN: r8354]]

[[Imported from SVN: r8353]]

[[Imported from SVN: r8352]]

[[Imported from SVN: r8351]]

[[Imported from SVN: r8350]]

[[Imported from SVN: r8349]]

move ddd stuff into dimension-dependent namespace.  This is needed for proper 3d parallel support in Dune.  Thanks to Andreas Lauser for the patch

[[Imported from SVN: r8348]]

rename END_NAMESPACE to END_UG_NAMESPACE, for increased consistency.  The old macro is still there for backward compatibility

[[Imported from SVN: r8347]]

[[Imported from SVN: r8346]]

[[Imported from SVN: r8345]]

[[Imported from SVN: r8344]]

on 64bit architectures (casts from pointer types) with the AutoTools 
build system.  The old build system used to change the definition of INT
for this.  Not having to do this is more elegant, however, because these
casts really only occur at these three places.

Thanks to Bernd Flemisch and Andreas Lauser for the patch.

[[Imported from SVN: r8343]]

[[Imported from SVN: r8342]]

[[Imported from SVN: r8341]]

[[Imported from SVN: r8340]]

[[Imported from SVN: r8339]]

[[Imported from SVN: r8338]]

[[Imported from SVN: r8337]]

[[Imported from SVN: r8336]]

[[Imported from SVN: r8335]]

[[Imported from SVN: r8334]]

[[Imported from SVN: r8333]]

[[Imported from SVN: r8332]]

[[Imported from SVN: r8331]]

[[Imported from SVN: r8330]]

[[Imported from SVN: r8329]]

add new methods GetBoundaySegmentId() which allows to access a consecutive, zero-starting index for each domain boundary segment.  this is needed by DUNE

[[Imported from SVN: r8328]]

[[Imported from SVN: r8327]]

The anonymous CVS in Heidelberg does not contain this directory
for legal and historical reasons.  The Stuttgart svn does contain
it, however the diff tool (apparently) does not include the 
content of missing directories into patch files.  Hence a clean
checkout from Heidelberg with patches from Stuttgart will still
not contain chaco, and every reference to it from the build
system is an error.

[[Imported from SVN: r8326]]

[[Imported from SVN: r8325]]

[[Imported from SVN: r8324]]

[[Imported from SVN: r8323]]

[[Imported from SVN: r8322]]

[[Imported from SVN: r8321]]

[[Imported from SVN: r8320]]

[[Imported from SVN: r8319]]

[[Imported from SVN: r8318]]

[[Imported from SVN: r8317]]